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EIGRP is a major topic for your CCNA and CCNP studies, and one basic skill you’ll need to pass your Cisco certification exams is to identify situations where you need to enable or disable split horizon. EIGRP commands tend to be a little different than those used with other protocols, so let’s take a look at how EIGRP and split horizon interoperate.

R1 is our hub router, with R2 and R3 as the spokes. There are no subinterfaces, and each router is advertising a single loopback network using its router number for each octet. R1 will see both R2 and R3’s loopback network, but the spokes will not have a route to the other spoke’s loopback. “show ip route eigrp” verifies this.

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You may need some reminders to assist you in saying, “No” more often. Most educators are agreeable folks and say ‘yes’…even when they need to say ‘no.’ The idea is to protect your ‘yesses’ for those tasks, responsibilities, and commitments that will make the most difference. That means that sometimes…you have to say ‘no.’ This article gives you some ideas for how and when to do so.

1. Sometimes, you just need to say, “No” and not add any additional explanation.
2. Sometimes, “No, but thanks for asking me” is the best answer.

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